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Speaker Malfunction

Speaker Malfunction

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

Diagnostic Fault Information






Circuit/System Description
Each of the audio output channel circuits (+) and (-), at the radio, Cd changer, and audio amplifier have a DC bias voltage that is one half of the battery voltage.When using a DMM, each of the audio output channel circuits will measure approximately 6.5V Dc. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1 V AC and less, where constant music may measure 3 V AC and slightly higher. In an amplified audio system, these similar AC voltage measurements may be slightly higher on the output of the amplifier, and the typical AC voltage readings at the output of the radio are less than 1 V AC.

Circuit/System Verification

Without Amplifier
Radio ON, verify clear audio is heard from each audio speaker.
^ If audio is inoperative from all speakers, replace the radio.
^ If audio is inoperative from one or more, but not all speakers or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction - without Amplifier.

With Amplifier
Radio ON, verify clear audio is heard from each audio speaker.
^ If audio is inoperative from all speakers, refer to Amplifier Circuit Malfunction.
^ If audio is inoperative from one or more, but not all speakers or the audio emitted from the speakers is not clear, refer to Speaker Circuit Malfunction - with Amplifier.

Circuit/System Testing

Speaker Circuit Malfunction - without Amplifier
1. Ignition OFF, inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. Improper speaker mounting or loose trim may cause an audible buzz or distortion.
^ If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.

2. Disconnect the harness connector at the appropriate speaker.
3. Radio ON, test for 5.0-7.5 volts between the speaker output circuit terminal 2 and ground.
^ If greater than the specified range, test the output circuit for a short to voltage.If the circuit tests normal, replace the radio.
^ If less than the specified range, test the output circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the radio.

4. Test for 5.0-7.5 volts between the speaker output circuit terminal 1 and ground.
^ If greater than the specified range, test the output circuit for a short to voltage.If the circuit tests normal, replace the radio.
^ If less than the specified range, test the output circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the radio.

5. If all circuits test normal, test or replace the inoperative speaker.

Amplifier Circuit Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 8 and ground.
^ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.If the circuit tests normal and the circuit fuse is open, replace the audio amplifier.

4. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
5. Radio ON, test for 0.6-1.0 volts between the amplifier mute circuit terminal 16 and ground.
^ If greater than the specified range, test the mute circuit for a short to voltage.If the circuit tests normal, replace the radio.
^ If less than the specified range, test the mute circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the radio.

6. Radio ON, test for B+ between the amplifier enable circuit terminal 8 and ground.
^ If less than the specified range, test the enable circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the radio.

7. If all circuits test normal, replace the audio amplifier.

Speaker Circuit Malfunction - with Amplifier
1. Ignition OFF, inspect the appropriate speaker and the surrounding interior trim for proper and secure mounting. Improper speaker mounting or loose trim may cause an audible buzz or distortion.
^ If the speaker or surrounding interior trim is found to be loose or improperly secured, correctly secure the item.

2. Disconnect the X3 harness connector at the audio amplifier.
3. Radio ON, test for 5.0-7.5 volts between the appropriate speaker output circuit terminal listed below and ground.
^ Left rear speaker output (-) terminal 1
^ Right rear speaker output (-) terminal 2
^ Left rear speaker output (+) terminal 3
^ Right rear speaker output (+) terminal 4
^ Right front speaker output (+) terminal 9
^ Left front speaker output (-) terminal 10
^ Right front speaker output (-) terminal 11
^ Left front speaker output (+) terminal 12

^ If greater than the specified range, test the output circuit for a short to voltage.If the circuit tests normal, replace the radio.
^ If less than the specified range, test the output circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the radio.

4. Ignition OFF, connect the X3 harness connector at the audio amplifier.
5. Disconnect the harness connector at the inoperative speaker.
6. Radio ON, test for 5.0-7.5 volts between the inoperative speaker output positive (+) circuit and ground.
^ If greater than the specified range, test the output circuit for a short to voltage.If the circuit tests normal, replace the audio amplifier.
^ If less than the specified range, test the output circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the audio amplifier.

7. Test for 5.0-7.5 volts between the inoperative speaker output negative (-) circuit and ground.
^ If greater than the specified range, test the output circuit for a short to voltage.If the circuit tests normal, replace the audio amplifier.
^ If less than the specified range, test the output circuit for a short to ground or an open/high resistance.If the circuit tests normal, replace the audio amplifier.

8. If all circuits test normal, replace the inoperative speaker.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information
^ [Speaker Replacement Reference]
^ [Control Module References] for Audio Amplifier and Radio replacement, setup, and programming Programming and Relearning
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